The Iron Overlord of Sichuan

Story

Bearing the traitor’s brand, Se-un Tang spent a lifetime creating the tools of the Murim's destruction, waiting for a single moment to strike. But when the decisive moment comes, he is instead thrust back in time, carrying the weight of a future that hasn't happened. Let the furnace roar, let the hammer sing, and let their blood quench the steel. The Demon Smith stands before the anvil once more to forge a path tempered in vengeance.

Synopsis via AniList (English).